Measuring-pump gearing



May 26, 1925. 1,539,106

L. E. BAKER MEASURING PUMP GEARING filed Aug. 8. 1924 2 Sheets-Sheet 1 1 N VEN TOR.

May 26, 1925. 1,539,106

E. BAKER MEASURING PUMP GEARING Q- Filed Aug. 8. 1924 2 Sheets-Sheet 2 ;j V///// l J A ?&

1 EMA F INVENTOR.

A TTORNEY.

Patented May 26, 1925.

UNITED STATE-S LINNAEUS BAKER, or FORT WAYNE,

PUMP COMPANY, or FORT WAYNE,

INDIANA, nssreuon rro WAYNE TANK & INDIANA, .e. ooaroisaTIoN or ENVDIANA.

MnAsumne-PUMP snare-rive.

Application filed Au uste, 1924-. Serial No. 730,846.

To all whom 2725 may concern:

lie it known that I, LINNAEUS E. BAKER, a citizen of the United States, residing at Fort Wayne, in the county of Allen and State of Indiana, have invented new and use ful Improvements in Measuring-Pump Hearing, of which the following is a specitioation.

My invention relates to measuring pump gearing for rack-driven piston pumps.

fine purpose of the mechanism is to en able the pump operator to rotate the crank in the same, so-called. forward, direction, both on the pumping and the return strokes of the rack and piston, and to shift very quickly from one direction of the movementof the rack to the other, the shifting being accomplished by simply adjusting the crank shaft in an axial direction, it being unnecessary to remove the hand used in rotating the crank from the handle, the same hand be ing used to shift the crank shaft.

Another purpose is to move the rack at a more rapid speed than that used in the driving stroke, because no work is then being done and little power is required.

Another purpose is to provide a simple, sturdy and compact mechanism without clutches.

My invention is illustrated in the accmpanying drawings, in which:

Figure 1, a detail, shows a vertical section through the gear case mechanism of a liquid dispensing apparatus on line 1--1 of Fig. 2 showing the rack and the gear mechanism,

Fig. 2 is the same on line 2-2 of Fig. 1 as though the mechanism was there shown in full, the driving pinion being in pumping position,

Fig. 3 is the same as Fig. 2 with the driving pinion in neutral position,

Fig. l is the same as Figs. 2 and 3, the driving pinion being in return stroke position,

Fig. 5 is a detail of a tooth of the intermediate gear showing the end beveled for easy entrance into mesh with the driving pinion,

Fig. 6 a detail, is one tooth of the driving pinion showing both ends beveled for easy entrance into mesh with either the in termediate gear or the rack,

Fig. 7 a detail, shows a vertical section through an alternative form of the gear for easy entrance into mesh with the driving pinion,

Fig. 10 is a detail of a tooth. of the rack pinion showing one end beveled .for easy entrance into mesh with the driving pinion, and

Fig. 11 is a detail of a tooth of the driving pinion showing both ends beveledfor easy entrance into mesh with either the inter-- mediate gear or the rack pinion.

Referring now to the drawings, Figs. 1 to 6 inclusive, B is the casing in which are journalled the driven shaft C and the crank shaft A. The driven shaft C carries a. fixed driven gear 0 near its outer end, and the driven pinion 0 fixed to said shaft and located near its inner end and always in mesh with the teeth of the rack D. The crank shaft A, which is long enough to permit axial shifting, has a crank a fixed to its outer end and a driving pinion a fixed in such a position that when the said shaft is shifted inwardly said pinion will mesh with the rack D, and when said shaft is shifted outwardly said pinion will mesh with the gear 0, said pinion being in neutral position between said contacts as shown in Fig.

In order to facilitate their entrance into mesh with said gears the outer ends of the teeth on the pinion o are beveled at a in such a manner as to more readily enable them to mesh with the rack D, and the corresponding ends of the teeth on the rack D may be beveled at d to further facilitate their entrance into mesh. The opposite ends of the teeth on pinion a are so beveled at a as to facilitate their entrance into mesh with the teeth of the gear 0 upon the driving shaft A being shifted outwardly. This ease of meshing may be further facilitated by suitably beveling the corresponding ends of the teeth on gear 0 at 0 It has been found that adequate ease of meshing is secured without beveling the teeth of the rack D or the teeth of the gear 0 and, therefore, generally this expense may be avoided.

An alternative form of the device is shown in Figs. 7, 8, 9, 10 and 11. The alternative form provides inclined or preferably helical teeth on the equivalent of the driving pinion a and equivalent of the intermediate gear 0, the teeth onthe rack and the pinions that mesh with it being preferably cut straight.

The object of this invention is to provide a mechanism that Will tend to stay in mesh While cranking upon driving, there being force applied upon reverse.

I claim as my invention and desire to secure by Letters Patent of the United States 1. Gearing for reciprocating piston measuring pumps, comprising in combination, toothed means for driving said piston While pumping, toothed means for driving said piston in reverse, a driving shaft With a pinion secured thereto, a crank for rotating said shaft, said shaft so journaled as to be axially adjustable so that its pinion may be brought into operating contact with either the toothed pumping means or the toothed reversing means by sliding the shaft in the appropriate direction by pressure on the crank.

2. Gearing for reciprocating piston measuring pumps, comprising in combination,

toothed means for driving said piston while pumping, toothed means for driving said piston in reverse, a driving shaft with a pinion secured thereto, a crank for rotating said shaft, said shaft so journaled as to be axially adjustable so that its'pinion may be brought into operating contact with either the toothed pumping means or the toothed reversing means by sliding the shaft in the appropriate direction by pressure on the crank the meshing being facilitated by beveling contacting ends of intermeshing teeth.

In testimony whereof I have hereunto set my hand.

LINNAEUS E. BAKER. 

